Stop suggesting random text as a snippet.

https://stackoverflow.com/questions/73092651/neovim-how-to-filter-out-text-snippets-from-nvim-lspconfig-nvim-cmp#comment129185571_73144320
lead me to https://github.com/hrsh7th/nvim-cmp/pull/1067 which fixed the
wonky mess that was happening.

modules/home-manager/files/nvim/lua/plugins/completions.lua

@@ -23,8 +23,13 @@ return {
           ["<CR>"] = cmp.mapping.confirm({ select = true }),
         }),
         sources = cmp.config.sources({
-          { name = "nvim_lsp" },
-          { name = "luasnip" }, -- For luasnip users.
+          {
+            name = "nvim_lsp",
+            entry_filter = function(entry)
+              return require("cmp.types").lsp.CompletionItemKind[entry:get_kind()] ~= "Text"
+            end,
+          },
+          { name = "luasnip" },
         }, {
           { name = "buffer" },
         }),